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Regarding AI, a Warrior is a much more formidable opponent than a Hero.
Against a Hero, the AI considers the current situation (which changes) and always lags behind and acts cautiously.
Against a Warrior, the AI doesn't think; it acts, going forward and head-on.
For me, the most interesting AI opponent is a well-developed Mage; the AI's use of counter-spells and mirror spells adds a unique element to the battle.